A few days ago I bought a 1950 steel shell 40° Sturmey ASC hub from UK eBay, allegedly in working order. (I have a couple of FC hubs if spares are needed.)
Unfortunately, 40° rims are almost unobtainable in Australia, and importing rims from elsewhere tends to be expensive, due to the volume. So, I'm wondering if it might be more practical to use say a 32° (or 36°?) hub instead. I could probably get a 20° rim fairly easily, but really don't want to damage the ASC flanges, given the hub shell is one of the few unique parts.
If anyone has suggestions about suitable 40° rims, or spoking patterns with <40° rims, please speak up!
Forgot to mention, the rim can be 622, 584 or even 559mm ETRTO BSD.
Thanks,
Stephen (who's in the UK at present but is returning to Sydney in a few weeks)
What rim for 40 hole Sturmey ASC hub???
Re: What rim for 40 hole Sturmey ASC hub???
the steel shell is quite robust; you can build a 32h rim onto a 40h shell quite easily, using two just spoke lengths. With most modern spokes it is necessary to use at least one spoke washer per spoke, else the fit in the hub is rather poor.
Since it will be difficult/impossible to use the original spoke holes with the same spoke orientation in every case it may be a good idea to fettle the spoke holes where necessary so that the sharp edge of the spoke hole doesn't damage the inside of the spoke J-bend. If re-using the spoke hole in the original orientation, this isn't usually necessary; usually the old spoke will have rounded the edge of the hole nicely.
Two different 'recipes' for rim 32 /hub 40 are given in this thread
https://forum.cyclinguk.org/viewtopic.php?f=5&t=118718
see my post of 17/12/17, 1.26pm
You can work out the exact spoke lengths using a spoke length calculator, by entering the fractional crossing values given in the thread.
cheers
Since it will be difficult/impossible to use the original spoke holes with the same spoke orientation in every case it may be a good idea to fettle the spoke holes where necessary so that the sharp edge of the spoke hole doesn't damage the inside of the spoke J-bend. If re-using the spoke hole in the original orientation, this isn't usually necessary; usually the old spoke will have rounded the edge of the hole nicely.
Two different 'recipes' for rim 32 /hub 40 are given in this thread
https://forum.cyclinguk.org/viewtopic.php?f=5&t=118718
see my post of 17/12/17, 1.26pm
You can work out the exact spoke lengths using a spoke length calculator, by entering the fractional crossing values given in the thread.
cheers
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~~~~~~~~~~~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~